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Welcome Fleet with Kotlin Multiplatform Tooling

Kotlin Multiplatform (KMP) is an open-source technology built by JetBrains that allows you to share code across multiple platforms while retaining the benefits of native programming. Supported platforms include iOS, Android, desktop, web, and others.

Today, we’re launching a preview for Kotlin Multiplatform support in Fleet, which simplifies the development of multiplatform applications, adding to the already extensive Kotlin support in Fleet. Please note that if you’re targeting iOS and macOS, you will need Xcode.

Get Started

Let’s take a look at some of the features.

Simplicity

When you open a multiplatform project, Fleet will automatically create Run Configurations for the Android and/or iOS platforms, as declared in the project build file. You can use these to execute your application on an Android Virtual Device or the iOS Simulator.

Kotlin Multiplatform Tooling in Fleet: Auto-generated Run Configurations for Android and/or iOS

Polyglot Programming

Because Fleet is a polyglot IDE, you don’t have to switch to a different editor or compromise usability when working with the native code in your multiplatform project. When editing Swift code, you have the same rich functionality you would expect in Kotlin and Java, as well as full support for Xcode projects.

Code navigation

Fleet supports cross-language navigation between Swift and Kotlin. For example, when you use the Show Usages action on a Kotlin function, any invocations from Swift code will feature in the results. If there is a single match, then the associated file is displayed.

Swift-Kotlin cross-language navigation

Refactoring

Refactoring in Fleet is also cross-language. In the example below, if we use Rename Refactoring on the MainViewController type, then the refactoring will apply across both Kotlin and Swift modules.

Swift-Kotlin cross-language refactoring

Debugging

Debugging in Fleet is also cross-language. You can set a breakpoint in Swift code, view values and the call stack in that environment, step into a Kotlin call, and then continue as required.

Swift-Kotlin cross-language refactoring

A single IDE

As you may be aware or have experienced, creating Kotlin Multiplatform applications has oftentimes involved needing to use multiple IDEs in combination. This is still the case when targeting mobile, as Android Studio and Xcode are required. However, our goal with Fleet is to provide a single IDE where you can develop applications without needing to switch tools (Xcode will still be required to be installed when targeting Apple devices, but will not be necessary for daily work).

Pricing model

During the Preview period, Fleet, including the Kotlin Multiplatform Tooling, will remain free. Once we release the tooling, we anticipate the pricing model will be in line with that of Fleet itself. We’ll provide more information closer to the release date.

Our commitment to IntelliJ IDEA and the IntelliJ Platform

Fleet uses the IntelliJ code-processing engine for Swift and all of our Kotlin support, and consequently, we will continue to provide support for Kotlin in IntelliJ IDEA and on the IntelliJ Platform (thus also Android Studio). In addition, we have an ever-increasing base of developers using Kotlin in IntelliJ IDEA, and we want to assure you that innovation and support will continue on this platform.

Having said that, the target audience for IntelliJ IDEA will primarily remain that of server-side developers targeting the JVM. While it will be possible to open, navigate, and build Kotlin Multiplatform projects in IntelliJ IDEA and Android Studio, other features such as platform-specific run configurations, Compose Multiplatform features, and many other things that facilitate multiplatform development will be supported in Fleet only.

How to get started

To get started with Kotlin Multiplatform development and try out all of the cool features we have been working on, you can install the latest version of Fleet via the JetBrains Toolbox App. We also have a brand new online Web Wizard for creating Kotlin Multiplatform projects.

Make sure you check out the Fleet for Kotlin Multiplatform Development tutorial for a step-by-step guide on creating your first application. You can also take a look at some of the KMP sample applications we’ve prepared.

Get Started

We need your feedback

It’s still very early days for Kotlin Multiplatform Tooling in Fleet, and we would love to hear your feedback. Let us know what works, what doesn’t, what is missing, and what you just can’t do without. Leave us a comment on this blog post or use our issue tracker. You can also share any feedback you have on Kotlin Multiplatform, including the tooling, on the #fleet channel on the Kotlin Slack.

Thank you!

Kotlin Support in Fleet: Explore a New IDE from JetBrains

JetBrains Fleet is a lightweight code editor and IDE that uses the IntelliJ code-processing engine. The product is now in public preview, so everyone can try it.

Currently, Fleet allows you to develop in Python, TypeScript / JavaScript, Go, Java, PHP, C#, and other popular languages such as Kotlin. Kotlin support is one of the most advanced, since Fleet is developed mostly in Kotlin and the JetBrains team also uses Fleet to develop Fleet. You can refer to the complete Fleet feature matrix that describes which languages and technologies the product already supports and which are still in the works. With plugins to come soon, more languages and technologies will be supported in the near future in Fleet.

In this blog post, we’d like to tell you more about the current state of Kotlin support in the Fleet Public Preview, including an overview of the different capabilities of the IDE for Kotlin projects.

Explore more

Why Fleet?

Fleet has been built from the ground up based on our many years of experience in IDE development. It combines the simplicity and speed of a lightweight text editor with the transformative power of an intelligent development environment.

Fleet is not designed to replace or replicate JetBrains’ existing IDEs. The main idea behind Fleet is to give developers a new experience with a smart, polyglot tool and workflows such as distributed and collaborative development and the use of generative AI for coding. JetBrains is working on Fleet while continuing to develop its existing IDEs.

Available features for Kotlin in Fleet Smart Mode

Kotlin is supported out of the box in Fleet, making working with the language not only productive and simple, but also enjoyable. It provides a streamlined experience for Kotlin developers. When you want to quickly dive into your project, analyze its structure, and make targeted edits in no time, you can use Fleet as an editor. But when need arises for more robust functionalities, it can transform into a full-fledged IDE.

If you want to enable code intelligence features in Kotlin, you should turn on Smart Mode. These additional features help you avoid mistakes while writing your code faster and more productively.

Enabling Smart Mode in Fleet

Once Smart Mode is enabled, you get access to the code editing features that IntelliJ IDEA users know and love, including:

Code completion
Code actions
Type and parameter information
Live templates
Code generation

Let’s take a closer look at these features and how they can streamline your coding routine.

Code completion

While you are typing, Fleet provides suggestions for completing your code based on various factors like available code intelligence services, the project structure, surrounding code, and symbol visibility.
The completion suggestions appear either automatically or when you manually activate them by pressing Ctrl+Space.

Code actions

Thanks to continuous code quality analysis, you can make informed decisions and enhance the efficiency of your coding process. Fleet suggests actions tailored to the specific context you’re working in. These suggestions encompass actions ranging from correcting errors to refactoring the code at the caret.

Code actions for Kotlin in Fleet

You can check which actions are available at the caret by pressing Opt+Enter (on macOS) or Alt+Enter (on Windows and Linux).

Once you have decided which action to use, you can either apply it right away or preview the result with a shortcut: Cmd+P on macOS, Ctrl+P on Windows and Linux.

Code actions for Kotlin in Fleet

Type info

If you are not sure what type you are currently dealing with, you can easily find out by pressing Cmd+Shift+T (on macOS) or Ctrl+Shift+T (on Windows and Linux).

This will prompt Fleet to show you the details about the static type of the symbol or expression.

Parameter info

Are you using a method that has numerous overloads, or do you need to quickly find the necessary parameters? Navigate through the available options simply by pressing Cmd+I (on macOS) or Ctrl+I (on Windows and Linux).

Live templates

Fleet provides a set of Kotlin live templates you can use to insert common constructs into your code, such as loops, conditions, declarations, or print statements. Unlike IntelliJ IDEA, Fleet doesn’t allow you to create new templates. However, you can use the many pre-made templates with your Kotlin code. Check out the complete list of live templates in the Fleet documentation.

Live templates for Kotlin in Fleet

Code generation

When you start typing a particular method or statement, Fleet suggests possible completion options based on the context and existing code. Simply select a suggestion to instantly generate the required code. You can take advantage of code completion to override superclass members like equals(), hashcode(), and other methods.

By using code generation, you can save time and make sure that your code follows the correct syntax and structure, as Fleet helps you generate the necessary code snippets.

Give Fleet a try and share your experience

Fleet is a polyglot code editor and IDE that supports Kotlin among many other languages. You can think of Fleet as a multipurpose tool and expect dedicated support for specific types of projects to come later.

If you are curious and see a use for a good new tool in your arsenal, we invite you to try Fleet for yourself and explore its capabilities!

The easiest way to download and get started with Fleet is by using the free JetBrains Toolbox App.

Try Fleet Preview

You can also watch this short Fleet overview video, which will help you get started, as well as turn to the documentation for further guidance.

Fleet is still in the Preview stage and is being actively developed. Your feedback and thoughts on the product will help the JetBrains team stabilize and improve it. If you encounter any issues, please submit reports to this issue tracker. You can also get in touch with us at fleet-support@jetbrains.com or @jetbrains_fleet.

Stay tuned for upcoming announcements!

What else to read and watch:

Getting started with Kotlin

JetBrains Fleet — Public Preview Launch Demo [Video]

Fleet 1.19, AI-powered Features and Easier Configuration for rust-analyzer, Python Interpreters, and npm

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